Biological shield in a nuclear power reactor is made of________________?
Correct answer: A. Concrete
- A. Concrete
- B. Steel
- C. Cadmium
- D. Zircaloy
Explanation
Concrete is used as the biological shield because its large thickness and density attenuate neutron and gamma radiation effectively. Steel and cadmium may serve specialised shielding or control functions, but are not the usual bulk biological shield.
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